Usually, the paint is applied at 350 to 400 square feet per gallon (the primer at 200 to 300 square feet per gallon). Use the Area section below to calculate walls. Painting ideas %26 DIY projects · DIY projects %26 ideas · 10 painting mistakes to avoid. As a painting professional will tell you, you can get about 400 square feet out of a gallon.
That's the size of a 20 x 20 room, which is equivalent to a typical two-car garage or a small studio apartment. In general, you can expect 1 gallon of paint to cover approximately 350 square feet. You need a little more than a gallon if the walls are made of unpainted drywall, which absorbs more paint. You should also consider whether you should paint more than one layer.
If you're painting unfinished, heavily patched or dark-colored walls, plan to apply two coats of paint. Anyone who has done their first interior painting project has been left in the paint aisle wondering how many cans they need to take home.